pioasm tool fails to build using `gcc-15.1` on host

[uzleosharif]

Steps to reproduce

# after cloning and changing dir into it

$ cmake -B build -S . -DPICO_PLATFORM=rp2350 -DPICO_BOARD=pico2 -DPICO_STDIO_USB=ON
$ cmake --build build/

Error log

› [ 51%] Creating directories for 'pioasmBuild'
  [ 51%] No download step for 'pioasmBuild'
  [ 52%] No update step for 'pioasmBuild'
  [ 52%] No patch step for 'pioasmBuild'
  [ 52%] Performing configure step for 'pioasmBuild'
  Not searching for unused variables given on the command line.
  loading initial cache file /stuff/work/pico-sdk/build/src/rp2_common/pico_cyw43_driver/pioasm/tmp/pioasmBuild-cache-Release.cmake
  -- The CXX compiler identification is GNU 15.1.0
  -- Detecting CXX compiler ABI info
  -- Detecting CXX compiler ABI info - done
  -- Check for working CXX compiler: /stuff/tools/gcc/15.1.0/bin/c++ - skipped
  -- Detecting CXX compile features
  -- Detecting CXX compile features - done
  -- Configuring done (0.2s)
  -- Generating done (0.0s)
  -- Build files have been written to: /stuff/work/pico-sdk/build/pioasm
  [ 52%] Performing build step for 'pioasmBuild'
  In file included from /stuff/tools/gcc/15.1.0/include/c++/15.1.0/x86_64-pc-linux-gnu/bits/gthr-default.h:35,
                   from /stuff/tools/gcc/15.1.0/include/c++/15.1.0/x86_64-pc-linux-gnu/bits/gthr.h:157,
                   from /stuff/tools/gcc/15.1.0/include/c++/15.1.0/ext/atomicity.h:37,
                   from /stuff/tools/gcc/15.1.0/include/c++/15.1.0/bits/ios_base.h:41,
                   from /stuff/tools/gcc/15.1.0/include/c++/15.1.0/ios:46,
                   from /stuff/tools/gcc/15.1.0/include/c++/15.1.0/bits/ostream.h:43,
                   from /stuff/tools/gcc/15.1.0/include/c++/15.1.0/ostream:42,
                   from /stuff/tools/gcc/15.1.0/include/c++/15.1.0/iostream:43,
                   from /stuff/work/pico-sdk/tools/pioasm/main.cpp:7:
  /stuff/tools/gcc/15.1.0/include/c++/15.1.0/ext/concurrence.h:257:32: error: cannot convert ‘<brace-enclosed initializer list>’ to
  ‘unsigned int’ in initialization
    257 |     __gthread_cond_t _M_cond = __GTHREAD_COND_INIT;
        |                                ^~~~~~~~~~~~~~~~~~~
  gmake[5]: *** [CMakeFiles/pioasm.dir/build.make:75: CMakeFiles/pioasm.dir/main.cpp.o] Error 1
  gmake[4]: *** [CMakeFiles/Makefile2:87: CMakeFiles/pioasm.dir/all] Error 2
  gmake[3]: *** [Makefile:136: all] Error 2
  gmake[2]: *** [src/rp2_common/pico_cyw43_driver/CMakeFiles/pioasmBuild.dir/build.make:95: src/rp2_common/pico_cyw43_driver/pioasm/src/
  pioasmBuild-stamp/pioasmBuild-build] Error 2
  gmake[1]: *** [CMakeFiles/Makefile2:2935: src/rp2_common/pico_cyw43_driver/CMakeFiles/pioasmBuild.dir/all] Error 2
  gmake: *** [Makefile:91: all] Error 2
   .. also one interesting thing i see already from this error log is the use of compiler 15.1.0 which is the host machine compiler and not
  the target arm-gcc toolchain compiler

[uzleosharif]

#2745 fixes the issue